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f in (-oo:+oo)
(3*f-10)/5 > 7 // - 7
(3*f-10)/5-7 > 0
(3*f-10)/5+(-7*5)/5 > 0
3*f-7*5-10 > 0
3*f-45 > 0
(3*f-45)/5 > 0
(3*f-45)/5 > 0 // * 5^2
5*(3*f-45) > 0
( 3*f-45 )
3*f-45 > 0 // + 45
3*f > 45 // : 3
f > 45/3
f > 15
( 5 )
5 > 0
f należy do R
(-oo:15) (15:+oo) 3*f-45 - + 5 + +
f in (15:+oo)
(15:+oo)
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